Well, that is unfortunately something that is usually not done and shipped with 
the distro, since it's too specific for a special generations of a system and 
the function is even given w/o this.
May I suggest that we pick this up in the release notes, like:

"
Performance tests showed that it is beneficial to use striding RQ with RoCE 
Express 2(.1) PCIe cards (ConnectX-4) on IBM z14 and LinuxONE Rockhopper II / 
Emperor II and newer - but by default it is not used.
Hence if one has RoCE 2(.1) hardware plugged in to such a system the enablement 
of striding RQ should be considered, like:
ethtool --set-priv-flags <ifname> rx_striding_rq on
For the reason of persistence one may also create a service file that sets this 
during boot-up.
"

Would that be ok make sense?

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https://bugs.launchpad.net/bugs/1868113

Title:
  [Ubuntu 20.04]  Striding RQ as Default for ConnectX-4

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